叶舞凹陷ZKX井深部盐层钻井液技术研究

Drilling Fluid Technology for Well ZKX of Deep Salt Bed in Yexian-Wuyang Depression

摘要:

叶舞凹陷ZKX井位于叶县盐田范围内，该钻探的目的是河南叶舞凹陷盐矿的普查，该井设计井深2630 m，在2000～2400 m连续取心，主要钻遇以泥页岩、砂岩、含盐膏层及盐岩为主的沉积岩地层，钻进过程中存在防塌、护心、井壁稳定等方面的问题和难点。针对ZKX井的钻井难点，在钻井液体系优化的基础上，根据不同地层分别采用了防塌钻井液体系、欠饱和盐水钻井液体系和饱和盐水钻井液体系，解决了水敏性泥页岩钻进的防塌及盐岩地层连续取心的钻井液技术难点，探索出了一套适用于盐膏层取心钻进的低成本钻井液技术思路。

Abstract:

Well ZKX is located in the salt bed of Yexian with the purpose of the salt mine survey in Yexian-Wuyang depression of Henan. The planned depth of the wellbore was 2630 m, and the continuous coring was operated from 2000 to 2400m. Mainly the sedimentary strata of mud shale, sandstone, and the salt rocks were drilled; there were difficulties in anti-sloughing, core protection and wellbore stability in drilling construction. On the basis of the optimization of the drilling fluid system and according to the different strata, the anti sloughing drilling fluid system, unsaturated salt water drilling fluid system and saturated salt water drilling fluid system were used respectively, which solves the technical difficulties of anti-sloughing in water sensitive shale and problems of drilling fluid for continuous coring in halite stratum. A set of technical ideas has been explored for low cost drilling fluid which is suitable to core drilling in salt bed.